What is the furthest distance of the mass from its equilibrium point? Calculus homework help

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What is the furthest distance of the mass from its equilibrium point? Calculus homework help

A mass is oscillating on the end of a spring. The distance, y, of the mass from its equilibrium point is given by the formula 

y=2 z cos (10 pi w t)

where 
y is in centimeters, 
t is time in seconds, and 
z and 
w are positive constants.

(a) What is the furthest distance of the mass from its equilibrium point? 
distance =  cm

(b) How many oscillations are completed in 1 second? 
number of oscillations =